[Pachi] Run Pachi on AWS

Kevin Zhou kvzrock at gmail.com
Mon Jun 17 03:00:23 CEST 2013

Here's my config file for kgsGTP:

room=Computer Go
engine=/home/ubuntu/pachi/pachi -e distributed slave_port=1234

My cluster has three nodes (c1.xlarge instance), each node. has 8 cores. By
running kgsGTP + pachi master + 8 pachi slaves on Node1, 8 pachi slaves on
each of the other nodes, I have 24 slaves running. And my winrate message
look like this:

scengine: In 22714 playouts at 24 threads, black B16 can win with 70.9%

scengine: In 256528 playouts at threads, black F15 can win with 69.8%

usually, the playout numbers are below 100K.

Is this typical for this configuration?

Can I add more slaves? Can I change the max number of simulated games
played on all slaves (default is 80K?)



On Sun, Jun 16, 2013 at 4:18 AM, Petr Baudis <pasky at ucw.cz> wrote:

>   Hi!
> On Sun, Jun 16, 2013 at 01:05:27AM -0500, Kevin Zhou wrote:
> > What's the playout count when running Pachi on your distributed system? I
> > have it setup on AWS with one instance of c1.xlarge, which has 8 cores
> and
> > 7G of RAM. And with 8 threads and 1000 seconds per move, I'm getting
> about
> > 50K playout count (output of winrate query). Is that typical?
>   That is certainly atypical, you should see much more. AIUI this is
> without the distributed engine? Please post Pachi's stdout output during
> generation of two successive moves, ideally with -d 4 commandline
> parameter, and exact commandline parameters you are using.
>   Best,
> --
>                                 Petr "Pasky" Baudis
>         For every complex problem there is an answer that is clear,
>         simple, and wrong.  -- H. L. Mencken
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